Numbers k such that (5*10^k - 143)/3 is prime.

Terms

a(0) =3a(1) =4a(2) =5a(3) =6a(4) =10a(5) =23a(6) =30a(7) =33a(8) =64a(9) =189a(10) =207a(11) =213a(12) =463a(13) =547a(14) =1225a(15) =1795a(16) =3726a(17) =3947a(18) =4989a(19) =5226a(20) =9825a(21) =11489a(22) =12666a(23) =14512a(24) =19588a(25) =28795a(26) =29903a(27) =31889a(28) =71357